layer

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layer

1. one of four or more levels of vegetation defined in ecological studies: the ground or moss layer, the field or herb layer, the shrub layer, and one or more tree layers
2. a laying hen
3. Horticulture
a. a shoot or branch rooted during layering
b. a plant produced as a result of layering

layer

[′lā·ər]
(computer science)
One of the divisions within which components or functions are isolated in a computer system with layered architecture or a communications system with layered protocols.
(geology)
A tabular body of rock, ice, sediment, or soil lying parallel to the supporting surface and distinctly limited above and below.
(geophysics)
One of several strata of ionized air, some of which exist only during the daytime, occurring at altitudes between 30 and 250 miles (50 and 400 kilometers); the layers reflect radio waves at certain frequencies and partially absorb others.
(metallurgy)
The stratum of weld metal consisting of one or more passes and lying parallel to the welding surface.

course

course, 1
1. A layer of masonry units running horizontally in a wall or, much less commonly, curved over an arch; it is bonded with mortar.
2. A continuous row or layer of material, as shingles, tiles, etc.

layer

layer

(1) One of several "drawing boards" or "canvasses" for creating elements in a picture. See layers and flatten layers.

(2) One of several levels in a communications protocol. See OSI model.
References in periodicals archive ?
D) Basal layer of the laminar corium from the abaxial wall, showing intense mitotic division of the keratinocytes at the tip of the red arrow.
The clinical and histopathological features seen in the cases of PLCA in this study were similar to those observed in other published studies although the basal layer pigmentary changes as well as dermal changes have not been reported commonly.
Immunopositive cells stained for Ki- 67 were detected only in the basal layer of the lining epithelium of the radicular cysts.
a) Atrophic epidermis, vacuolar degeneration of basal layer, edema in upper dermis, and lymphocytic infiltration (H-E x 100).
However, there was melanin in the upper dermis and basal area, vacuolization of the basal layer, and pigment incontinence in the hyperpigmented lesion.
Physiological differentiation was confirmed by immunohistological staining, showing a physiological location of cytokeratin-14 in the basal layer and cytokeratin-10 in the suprabasal layers (Fuchs, 2009).
Basal cell tumors are common cutaneous epithelial neoplasms in domestic dogs and cats [10] originating from cells of the basal layer of the epidermis but without epidermal or adnexal differentiation [11, 12].
The location of the biopsies must be considered: basal layer hyperplasia, elongation of the papillae, and occasionally eosinophils may be seen within 1 to 2 cm of the gastroesophageal junction, possibly as a result of physiologic reflux.
The cells of the basal layer of the epidermis then undergo dimorphism from a cubic to a cylindrical shape, at which point the production of the basal membrane occurs (Bockelmann et al.
The cell proliferation in the basal layer has been found to increase by 2-3 times, but this is not compensated by an increased desquamation rate (9).
The volume density of the glycogen-rich cells and the giant cells of the trophoblast, as well as the absolute volume of these two types of cells in the basal layer of placenta, were also determined.
Moderate dysplasia involves basal layer to middle of granular layer (figure 9).